<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <!--径向渐变，圆形渐变-->
    <style>
        body {
            /*background-color: #21D4FD;*/
            /*background-color: #21D4FD;*/
            background-image: linear-gradient(19deg, #21D4FD 0%, #00ff4e 100%);

        }

    </style>

</head>
<body>

</body>
</html>